I trust you are referring to the front wheel bearing, as you won't be replacing the rear one by the roadside
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I've not heard of a D3/4 wheel bearing suddenly failing. They seem to be able to be noisy for a long time and still don't fall apart when removed.
The nearside bearing I just replaced had some movement in it, and when the hub was pushed out left the outer taper bearing on the hub shaft.
There was just dry grease in what was left of the bearing and a lot of movement.
The taper bearing left on the shaft had to be cut off. It broke my bearing puller.
Certainly built very solid, but not designed to be be replaced easily.
Well! Wasn't quite that easy.
It ended up with multiple angled cuts, one a little bit further than most of the way through😖, the cast part broke leaving parts of the race not wanting to give.
Brought a new puller this morning, not a cheap ebay one.
Round 2 next week ( maybe).
I thought after 50 years of collecting tools I would have everything I would need,but then I bought a Discovery
Too bad you can't just replace the whole section, what's left after the hub and bearing anyway!